| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | E | Signal Telephone on | Eject box |
| | | |
| 2 | E | Signal, data IN SIM card | Eject box |
| | | |
| 3 | | Not used | |
| | | |
| 4 | | Not used | |
| | | |
| 5 | | Not used | |
| | | |
| 6 | | Not used | |
| | | |
| 7 | | Not used | |
| | | |
| 8 | | Not used | |
| | | |
| 9 | | Not used | |
| | | |
| 10 | | Not used | |
| | | |
| 11 | | Not used | |
| | | |
| 12 | E | Terminal R | Fuse F7 |
| | | |
| 13 | A/E | K-bus signal | K-bus connector |
| | | |
| 14 | | Not used | |
| | | |
| 15 | | Not used | |
| | | |
| 16 | | Not used | |
| | | |
| 17 | A | Signal, telephone AF - | Voice input |
| | | |
| 18 | A | Signal, telephone AF + | Voice input |
| | | |
| 19 | A | Voltage supply | Eject box |
| | | |
| 20 | E | Signal, reset SIM card | Eject box |
| | | |
| 21 | | Not used | |
| | | |
| 22 | | Not used | |
| | | |
| 23 | | Not used | |
| | | |
| 24 | M | Ground | Ground connector |
| | | |
| 25 | E | Terminal 30 | Fuse F39 |
| | | |
| 26 | | Not used | |
| | | |
| 27 | | Not used | |
| | | |
| 28 | | Not used | |
| | | |
| 29 | A | Signal, telephone mute | Connector X4553 MUTE |
| | | |
| 30 | | Not used | |
| | | |
| 31 | E | Terminal 30 | Fuse F39 |
| | | |
| 32 | E | Terminal 30 | Fuse F39 |
| | | |
| 33 | M | Ground | Ground connector |
| | | |
| 34 | M | Ground | Ground connector |
| | | |
| 35 | | Not used | |
| | | |
| 36 | | Not used | |
| | | |
| 37 | E | Signal, SIM card inserted | Eject box |
| | | |
| 38 | E | Signal, data OUT SIM card | Eject box |
| | | |
| 39 | M | Shield | Eject box |
| | | |
| 40 | | Not used | |
| | | |
| 41 | | Not used | |
| | | |
| 42 | M | Ground | Ground connector |
| | | |
| 43 | E | Terminal 30 | Fuse F39 |
| | | |
| 44 | | Not used | |
| | | |
| 45 | | Not used | |
| | | |
| 46 | | Not used | |
| | | |
| 47 | A | Signal Telephone on | Voice input |
| | | |
| 48 | E | Signal, switch off WDCT | Eject box |
| | | |
| 49 | | Not used | |
| | | |
| 50 | | Not used | |
| | | |
| 51 | | Not used | |
| | | |
| 52 | M | Negative activation Microphone | Voice input |
| | | |
| 53 | M | Shield | Voice input |
| | | |
| 54 | A | Positive activation Microphone | Voice input |
| | | |